Islam is considered the fastest growing religion in the world.
There are approximately 1.3 billion Muslims constituting a fifth of
humanity. Most are under 25.

Around 85 per cent of Muslims belong to the majority Sunni sect. The minority
Shia Muslims are concentrated in Iran and Iraq.

Less than 20 per cent of Muslims are Arabs. Almost half of the worlds Muslims live
in South and Southeast Asia.

Worlds most Muslim nations
The populations of the following countries are almost entirely Muslim. That is, about
99.5% or more of the native populations, and nearly all of the foreign workers, are
Muslim.

Bahrain
Comoros
Kuwait
Maldives
Mauritania
Mayotte

Morocco
Oman
Qatar
Somalia
Saudi Arabia
Tunisia

United Arab Emirates
Western Sahara
Yemen

Largest national Muslim populations

Country

Number of Muslims

Indonesia

170,310,000

Pakistan

136,000,000

Bangladesh

106,050,000

India

103,000,000

Turkey

62,410,000

Iran

60,790,000

Egypt

53,730,000

Nigeria

47,720,000

China

37,108,000

Sizeable Muslim communities
There are also sizeable Muslim communities in the following countries. The US has an estimated 5.7 million Muslims  roughly equal to its Jewish
population France has an estimated 3 million Germany has an estimated 2.5 million The UK has an estimated 1.5 million Canada has an estimated 0.5 a million Australia has an estimated 200,000

Refugees
The majority of the worlds estimated 12 million refugees are Muslim. And most of
them take refuge in other Muslim countries.

According to Indian Government the total percentage of Muslim in India is in between 11% to 12%. Since the independence of India in 1947 the percentage of Muslim in government census has remained same, i,e, 12% or less. In an interview with a well circulated newspaper of India "The Hindu", Mr. Justice K. M. Yusuf, a retired Judge from Calcutta High Court and chairman of West Bengal Minority Commission, says that in his view the total percentage of Muslims in India is at least 20 percentage.

The total muslim population worldwide is estimated around 1.5 billion.